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Old 04-15-2019, 06:10 PM   #1 (permalink)
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Primary Case Capacity- Softail Heritage

Ok, I recently drained and refilled my primary and started thinking something did not seem right on the fill amount. With the bike upright and perfectly level, I let it drain overnight. Then filled it to the bottom of the clutch diaphragm ring as per the repair manual. It took 51 oz. Went back and looked at the manual which says capacity is 26 oz. Am l reading this wrong?
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Old 04-15-2019, 06:43 PM   #2 (permalink)
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RustyG is reading this now saying WTF is this?
I have never understood that measurement of fill it to the bottom of the clutch plates or whatever. My manual says 32 Oz's. That is what I use and have been for 250,000 miles. No problems.
When using 32 ounces I have never seen the fluid level just looking at it after a fill up.
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PS: I always drain mine overnight with the bike sitting on the side stand
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Old 04-15-2019, 08:41 PM   #3 (permalink)
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Re-read it, 51oz seems like way to much.
26oz sounds more like the 5 speed transmission capacity.
Most older primaries held 32oz but newer models carry 40 or so.
What year is your bike?
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Old 04-15-2019, 09:44 PM   #4 (permalink)
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Bike should be on the Jiffy Stand, then 32oz will be at the clutch plates.
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Old 04-15-2019, 10:14 PM   #5 (permalink)
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I've always done mine upright on the lift to the bottom of the clutch as shown in the manual. I don't recall seeing where it should be on the stand but have always done it this way without issue and it comes out about right for the stated capacity.
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Old 04-15-2019, 11:49 PM   #6 (permalink)
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Old 04-16-2019, 09:06 AM   #7 (permalink)
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Manual says that capacity of the primary is 26oz with the bike upright and level on my 2004 Softail.
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Old 04-16-2019, 09:20 AM   #8 (permalink)
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Quote:
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Manual says that capacity of the primary is 26oz with the bike upright and level on my 2004 Softail.
Same for my 05 softail.
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Old 04-16-2019, 06:38 PM   #9 (permalink)
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RustyG is reading this now saying WTF is this?
Same for my 2002 Road King.
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Old 04-18-2019, 05:50 PM   #10 (permalink)
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Anything over 32 oz sounds way too much. For me it’s always right at 32 and never had problems. Mines a 2011 96” so may be different. But I’d bet between the 26-32 mark your good

Would think you’d have major clutch drag if it is way overfilled
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Old 04-18-2019, 10:10 PM   #11 (permalink)
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Anything over 32 oz sounds way too much. For me its always right at 32 and never had problems. Mines a 2011 96 so may be different. But Id bet between the 26-32 mark your good

Would think youd have major clutch drag if it is way overfilled
Thats what is bothering me. Bike was upright and filled to just touching the bottom of the spring diaphragm, as illustrated in the manual. Once I test ride and if, as you say, have clutch drag- that will tell me Ive over filled it.
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Old 04-18-2019, 10:23 PM   #12 (permalink)
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tall terry is still riding a stock bike tall terry is still riding a stock bike
I put 32 ounces in them
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Old 04-18-2019, 11:20 PM   #13 (permalink)
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Agreed
It’s one of the few Things MoCo did simple for most part so you’re beyond good at 32

Mainly cools the chains and the fact you Maintain that HOG I love!
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Old 04-18-2019, 11:33 PM   #14 (permalink)
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I didn’t help earlier
Ride the bike 15-20 minutes and get it warm not hot and look for smooth shifts

If you don’t like that get it on a stand with a buddy. I have never like the idea of topping them to spill point
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Old 04-19-2019, 02:34 AM   #15 (permalink)
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Quote:
Originally Posted by rkt88403 View Post
Manual says that capacity of the primary is 26oz with the bike upright and level on my 2004 Softail.
That's exactly what my 2004 Heritage Took .. And just to stray a bit the same for my 05 Dyna ..
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